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The word user appe ars under the numbers as soon as the hp 11c calculator is turned on when using any of the functions such as squa re root thru 1 x quot the result is given as erro r 4. For hp products a product number examples lg534ua for samsung print products enter the m c or model code found on the product label examples sl m2020w xaa include keywords along with product name examples laserjet pro p1102 paper jam elitebook 840 g3 bios update need help finding your product name or product number. Hp 11c calculator manual 09 27 2012 0938 am hi switch the calculator off then press and hold the decimal key and simultaneously switch the calculator on regards bart calculator enthusiast 0 kudos coradpress honor student 2 0 0 message 10 of 13 14160 flag post hp recommended mark as new . Hp 12c financial calculator users guide h edition 4 hp part number 0012c 90001 2 register your product at wwwregisterhpcom this manual and any examples contained herein are provided as is and are subject to change without notice hewlett packard company makes no warranty of any kind with regard to this manual including but not